Coffee-roasting machine.



PATBNTED FEB. 13, 1906 F. T. HOLMES. COFFEE ROASTING MACHINE.

APPLIUATIOH I'ILE!) JELY 12, 1905.

3 SHEETSSHET l liar-megs.

N0. 812,268. PATENTED FEB. 13, 1905 F. T. HOLMES.

COFFEE ROASTING MACHINE.

APPLICATION FILED NIL! 12,1905.

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PATENTED FEB. 13, 1906.

Na;x 812,268

F. T. HOLMES.

COFFEE ROASTING MACHINE.

APPLICATION FILED JULY 12. 1905.

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ZKZrzemes' UNITED sTA rns rn rnsr orinon.

FRANK 'l. l-lOlih'll lS, Oi BRUOKLYR, EEW YORK, ASSIGNOR OF ONE-HALF TO ll U N'lLlGY MANUFACTURING COMPANY, OF SILVERUREEK, NEW YORK.

COFFEE- BOASTING MACHINE.

Specification of Letters Patent.

Patented Feb. 13, 1906.

Application filed Joly 12, 1905- Serial No. 269,310.

To all whom it out concern:

Be it known that I, FRANK '1. Holmes, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Cofi'ec-Roastim Machines, of which the following is a specification.

This invention relates to that class of coffeeroasting machines which contain 9. perforated drum in which the berries are subjected to the heat generated by one or more gasflsmes and in which air is drawn into the drum by an exhaust mechanism which is connected with the casing by which the drum is surrounded, so that the air which enters the drum becomes heated by the flame and asses, mixed with the hot gases, outwardly t ough the peri'orntions of the drum into the space between the drum and the casing and thence to the exhaust.

The objects of this invention are to create a stron and uniform outward draft through the perforations of the drum and to prevent the accumulation of chafl' in the space between the drum and the casing, to provide simple and eflective means for separating the chail from the air-current, to improve the driving mechanism, and to improve the mar ehine in other respects. A

in the accompanying drawings, consisting of three sheets, Fi ure 1 is a front elevation of the machine. l ig. 2 is a longitudinal seetional elevation. Fig. 3 is a vertical crosssection in line 3 3, Fig. 2. Fig. 4 is a. fragmentary longitudinal section through the exhaust-spout and casing in line 4 4, Fig. 3.

Like letters of reference refer to like parts in the several figures.

The inclosing casing, in which the roastingdrum is arran ed, consists, preferably, of an annular front head A, an annular rear head A, and a connecting cylindrical shell A. The upper portion of the shell is preferably provid ed with a protec tive linin a, of asbestos or other suitable material, helr in place by a metallic lining a. The casing is supported. at a suitable height by a base-frame a.

Each of {hel eads A A is n-nvided with a central opening I), in which is secured a flanged annular frame B B, respectively, which is covered on its inner side by a screen I), of wire-cloth or other suitable materiai. The marginal portion of the annular frame preferably composed of a fla b and e and opens inwardly through the screen I), so

as to project a horizontal sheet of flame into the drum. The mixture of air end gas is so plied to the burner which is of the Weilnown atmospheric hind, by the usual mixing-tube D, which receives the gas fronts pipe d.

The roastingdrum is composed of an outwerdlyflaring front head E, an outwardlycontraeted rear heed E, and a connecting perforated cylindrical shell E. The heads E E are provided with spiders e e, respectively, by which they are secured to the shaft c. The front head rotates within a flanged lining e, which is secured to the inner side of the front head A of the stationary cans ing and which forms a practically tight joint between the open front end of the drum and the front head of the easing. The rear head E of the drum is contracted outwardly to fit around the inwardly-proj ecting annular frame B? of the rear head A of the casing and forms a practically tight joint therewith. The perforations f of the roasting-drum are preferably elongated and inelil ed to the axis of the drum, as shown, in order to scour the coffee-berries efi'ectively. The drum is provided on its inner side with thusual elevatin blades or wings G, which are arranged ob li uely to the axis of the drum and alter nate y in opposite directions, so as to cause the coffee to move beck and forth in the ion itudinal direction of the drum as the coffee is being elevated and dro ped. The drum is provided on its outer si e with longitudinal Wings or blades H, which sweep through the annular space between the drum and the inelosed casing.

I represents a f ed-hopper of any suitable construction arranged 011 the front head A of the casing, and 1' represents the dischargeopening in tl'l. front head closed by a door I. I represents n slide in the bottom portion of the casing for givin ress to the interior thereof.

K represents a suction-spout, which is ar- -mged with its inlet-opening lengthwise in no side of the shell A of the casing near the dowliwardly-inoving side of the dru1n,so that the wings ll of the drum will sweep the chaff through the space between the drum and the casing to the suction-spout. The latter extends practically from end to end of the easing and distributes the draft throughout the length thereof. The wings of the drum prevent the chaff from accumulating in. the space between the drum and the casing and carry to the inlet of the suction-spout all chaff which may settle or drop out of the aircurrent. The suction-spout K extends downwardly from the casing to the top of asettlingchamber L, in which the bulk of the chaff is separated from the air. This settling-chainher is preferably provided with staggered upright screens 1 Z, the front screen i having an opening at the bottom and the second screen 1 having an opening at the top, so that the air passes partly through the screens and partly in a baffled or zigzag course through the passages formed by the screens in the settling-chamber. The separated chaff is deposited in the chamber and removed from time to time. The chamber is preferably )rovided with a jacket Z, which is kept filled with water for keepin the chamber cool. An air trunk or spout m Teads from the settlingehamber to a suction-spout m, connected with the eye of the fan M, which is arranged at the rear side of the machine. The spout m is govided with a damper m represents the usual receiver or coolingbox for the roasted coffee arranged on the front side of the machine below the discharge opening I and provided with the usual false bottom n of wire-cloth or perforated metal.

0 represents an air-trunk which leads from the space underneath the false bottom to the suction-spout 'm' of the fan and which is provided with a damper O.

The drum and the fan are preferably actuated from an electric motor P,which is mounted upon the stationary casing. The fan is driven directly from the armature-shaft p by a belt p, which runs around a pulle p on this shaft and a pulley p on the fan-s aft 1). The drum is driven at a much slower speed than the fan by a gearing which comprises a pinion Q, secured to the armature-shaft, a igear-wheel Q on a counter-shaft Q, a puley Q on said counter-shaft, a pulley Q on the drum-shaft c, and a belt Q. A speed of from forty-five to fifty-five revolutions per minute for the drum-shaft and from ei hteen hundred to two thousand per minute for the fan-shaft will give good results. The countershaft Q is mounted on the motor and bears a fixed relation to the armatureshaft p, which is the driving-shaft, and both shafts bear a fixed relation to the stationary casing on which the motor is su ported and to the perforated drum arrange in the casing, the whole forming a self-contained portable machine.

In the operation of this machine the gasburners D project horizontal sheets of flame into the open ends of the drum. The internal elevating blades or wings alternately elevate the coffee and drop it through these sheets of flame. The suction of the fan draws the external air into the drum at both ends thereof through the screens 1) and draws the hot gases and heated air outwardly through the perforations of the drum into the annular space between the drum and the casing. The heated air and gases pass from the annular space outside of the drum, together with the e aff which has escaped through the perfora tions of the drum, through the suction-spout K into the settlin -chamber L, in which the chaff is deposited partly by gravity and partly by the screening operation. The fan also draws an air-current from the coolingbox N through the spout 12/ upon openin the damper 0 when the roasted cofiee has Tueen discharged into the box.

I claim as my invention 1. The combination of a perforated revolving drum, means for heating the same, an inclosin stationary casing, a suction-s out arrange in the side of the casing, lengt wise of the drum, and wings on the drum which sweep through the space between the drum and the casing and carr the chaff to said suction-spout; substantia 1y as set forth.

2. The combination of a perforated revolving drum, means for heating the same, an inclosin stationary casing, a suction-s out arrange in the side of the casin lengt wise of the drum and at the descen ing side of the same, wings on the drum which sweep through the space between the drum and the casing and carry the chaff to the suctionspout, a settling-chamber with which said spout is connected, and an exhaust-fan connected with said chamber, substantially as set forth.

3. The combination of a perforated, revolving, open-ended drum, a burner projecting a fiame into the same, an inclosing stationary casing, a suction-spout arranged in the side of the lower portion of the casing and extending lengthwise of the drum, and a suction-fan connected with said spout, substantially as set forth.

4. The combination of a stationary inelosing casing having its front and rear heads provided with open annular frames for the admission of air and hav' a guard-flange on the inner side of the front sad, and a perforated roasting-drum having its front end arranged adjacent to said guard-flange and havm its rear end constructed to fit around the a jacent annular frame, substantially as set forth.

5. The combination of a stationary inclosing casing, having its front and rear heads provided with open annular frames for the admission of air and having a guard-flange on the inner side of the from head, :1 perforated roasting-drum having its front end arranged adjacent. m said guard-flange and having its rear end lined :mmml the adjacent, annular frmlle, :1 suctim'x-spmlt. emmvz'tmi with said casing, and n1 suction-fun emlnevted with said SPUHE,S11l) &L2il1l'iH \'21S set. forth.

(3. The eumhimuiun uf a perfm'nted masting-(h'um, 2m inc-losing S'Li'lLiUllfliY casing, 21 suctibxvspuut arranged in the side 0f the Gas ing, a settling-chemher (-mmeeted with said spout, baffie-svreens arranged in said chamher, and a suction-fun connected with said eluu'nber substantinily as set; forth.

7. The combination of a perforated roasb hag-drum, an inclosing stationary casing, a suetiomspout armnged in the side of the easing, a settling-chamber connected with said spout, a 'eoolin -ehamber for the roasted coffee, a suetieni an, and 3 outs leading from said settling-chamber am said coding-chamher to said sueti0nfan, suhsiantially as set forth.

FRANK T. HOLMES.

VVi messes HARRIET L. WHITE. W. H. WHITE. 

